Victoria, South Australia and Tasmania lashed by massive storm cell

Melbourne and Adelaide are being lashed by heavy wind and rain as a massive storm cell engulfs Australia's south.

While wind gusts of up to 100km/h have added extra sting to the rain in Melbourne, the worst damage so far has been recorded in Adelaide, where a car has been crushed and thousands of homes left without power.

A Norwood shopfront was damaged when the iron bark came down, destroying a vehicle and causing traffic pandemonium, but thankfully not causing any serious injuries, The Advertiser reports.

It was the second such incident today with the fierce weather toppling another tree across train tracks in the Adelaide Hills.

Some 10 districts have been put on alert, with flooding expected in many areas, including the Outer Harbour near Port Adelaide, where king tides are expected to roar past the shoreline.

Melbourne, by contrast, seems to have gotten off relatively lightly, with many residents used to four seasons in one day taking to social media to deem the hashtag "Melb weather" as somewhat redundant.